Introduction to Reciprocity for Photographic Exposure


show more Reciprocity provides you with in-depth training on Photography. Taught by Ben Long as part of the Foundations of Photography: Exposure show less
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Reciprocity

In program mode, when you half-press the shutter button on your camera, your camera meters the scene and calculates a shutter speed and aperture that will be adequately exposed, neither too bright nor too dark. In shutter priority mode, as you've seen, you can dial in a shutter speed, and the camera will choose a corresponding aperture that is neither too bright nor too dark. In other words, in both of these modes, your meter protects you from over- or underexposing. Well, let's look closer at what happens when I change shutter speed, when I'm in shutter priority mode. I'm back here with a scene we saw before, the toy with the spinning spaceships.

Let's say I want to shoot it to freeze motion, so I dial in a shutter speed of say 1/500th of a second. So here I am in shutter priority mode. I'm dialing up to 1/500th of a second. When I half-press the meter, I see that the camera has chosen an aperture of f/2.0. Now let's say I decide I want to blur the motion instead...

Reciprocity
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Reciprocity provides you with in-depth training on Photography. Taught by Ben Long as part of the Foundations of Photography: Exposure

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Photography
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